Sharp R-209FW Service Manual - Page 14
High Voltage Capacitor Test, Switch Test, Temperature Fuse Test, Blown Fuse F1, Noise Filter Test
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R-209(IN) R-209(W) R-209(Y) TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST D HIGH VOLTAGE CAPACITOR TEST CARRY OUT 3D CHECKS. A. Isolate the high voltage capacitor from the circuit. B. Continuity check must be carried out with measuring instrument which is set to the highest resistance range. C. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10MΩ after it has been charged. D. A short-circuited capacitor shows continuity all the time. E. An open capacitor constantly shows a resistance about 10 MΩ because of its internal 10MΩ resistance. F. When the internal wire is opened in the high voltage capacitor, the capacitor shows an infinite resistance. G. The resistance across all the terminals and the chassis must be infinite when the capacitor is normal. If incorrect reading are obtained, the high voltage capacitor must be replaced. CARRY OUT 4R CHECKS. E SWITCH TEST CARRY OUT 3D CHECKS. Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table. Table: Terminal Connection of Switch Plunger Operation COM to NO COM to NC Released Open circuit Short circuit Depressed Short circuit Open circuit COM; Common terminal, NO; Normally open terminal NC; Normally close terminal If incorrect readings are obtained, make the necessary switch adjustment or replace the switch. CARRY OUT 4R CHECKS. F TEMPERATURE FUSE TEST CARRY OUT 3D CHECKS. A continuity check across the temperature fuse terminals should indicate a closed circuit unless the temperature of the temperature fuse reaches approximately 248˚F(120˚C). An open temperature fuse indicates overheating of the oven, exchange the temperature fuse and check inside of oven cavity and for improper setting of cooking time or operation of control unit. Check for restricted air flow through the vent holes of the oven cavity, especially the cooling fan and air guide. CARRY OUT 4R CHECKS. G BLOWN FUSE F1 CARRY OUT 3D CHECKS. 1. If the fuse F1 is blown, there could be a shorts or grounds in electrical parts or wire harness. Check them and replace the defective parts or repair the wire harness. 2. If the fuse F1 is blown when the door is opened, check the monitored latch switch SW1, monitor switch SW2, timer switch and relay RY1. If the fuse F1 is blown by incorrect door switching replace the defective switch(es) and the fuse F1. CARRY OUT 4R CHECKS. CAUTION: Only replace fuse with the correct value replacement. H NOISE FILTER TEST CARRY OUT 3D CHECKS. Disconnect the leads from the terminals of noise filter. 12